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Note 15 - Related Party Transactions (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 03, 2017
Dec. 02, 2017
Jul. 12, 2017
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings $ 255,141          
Long-term Convertible Notes Payable to Multiple Private Investors [Member]            
Debt Instrument, Interest Rate, Stated Percentage           5.00%
CEN Biotech Ukraine [Member] | Scenario, Forecast [Member]            
Business Acquisition, Percentage of Voting Interests Acquired     51.00%      
CEN Biotech Ukraine [Member]            
Due from Related Parties 775,328 $ 425,328        
Percentage of Related Party's Equity Interest Owned by Director       25.50% 51.00%  
CEN Biotech Ukraine [Member] | Equipment Sold to Related Party in Exchange for Note Receivable [Member]            
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings 255,141          
Notes Receivable, Related Parties 44,859          
Board Members and Officers [Member] | Consulting Fees [Member]            
Related Party Transaction, Amounts of Transaction 767,249 24,000        
Due to Related Parties 11,986 $ 62,994        
R&D Labs Canada, Inc [Member] | Purchased Equipment in Exchange for Note Payable [Member]            
Notes Payable, Related Parties $ 300,000